Improvement in syringes



W. P. CLUTWORTHY.

Syringe.

N0 \Q 238 Paytented 0ct.26.1875.

N-FET-ERS. PHOTO-LITHOGRAPHER. WASHINGTUN. D C.

UNITED STATES i PATENT 'OFFICII Y WILLIAM P. CLOTWORTHY, OF BALTIMORE, MARYLAND..

IMPRovEMENT IN svRlltc-zes.4

specification forming part of Letters Patent No. 169,238, dated october 2e, i855; application mea october e, 1875.

CASE B.

To all whom it may concern:

Be it known Vthat I, WILLIAM P. CLOT- WORTHY, of Baltimore city, in the State vof Maryland, have invented certain new and useful Improvements in Syringes; and I do hereby declare that the following is a specification of thesame.

I have improved the syringe patented to me August 24, 1875, No. 166,967, in several important particulars, and by which I obtain highly useful advantages.

I'combine with the barrel of syringes a rubber jacket or inclosing-case, which, iittin g the barrel tightly,`has perforations at its injecting end coincident with those in the barrel for adaptation as a female syringe, and by such combination I obtaina protection for the glass barrel, and render it less liable to break, and should it be broken prevent thereby injury to the person. A rubber tube or covering is combined with the piston-rod, which may be either of metal .or glass, and if the former all corrosion thereof is prevented, and if the latter, and it should become broken, the rubber tube or covering will brace and hold it intact, and serve as a continuous splint, so that if the fracture should be in one orv more pieces it will yet be sufiicientlyrigid to be serviceable. The piston is of solid rubber, is more durable than an in'- lated bulb, or any other'substance hitherto used in syringes, and besides is more effective in making a closer t in the barrel, and is of such construction as to adapt it to `barrels of different sizes, and with the rubber covering of the piston-rod renders it more effective in` maintaining a closer fit, and in being more durable than` cork, wood, or metal. These several features constitute the invention claimed in this patent, and give to the syringe a degree of durability and usefulness not attained-in any article for the purpose hitherto furnished by the trade.

In the accompanying drawings, Figure l represents an exterior view of my improved syringe Fig. 2, a longitudinal -section of the same 5 Fig. 3, a view of the solid-rubber piston and its rubber-covered piston-rod, and showing the rubber cap thereon and Fig. 4, a cross-section.

The barrel c isof glass, rounded at one end, and provided with perforations' b, through which the liquid is forced out. It is covered and protected by a rubber jacket, c, which fits tightly thereon, conforms to the rounded end of the glass syringe-barrel, and has perforationsd coincident with those in the barrel.

It is of equal length with' the barrel, and of course open at the filling end thereof, andis made of such thickness as will 'afford proper protection. vThe piston-rod eis covered by a tightly-iitting rubber tube or covering, f, which isolates the rod from 'corroding effect of the liquid medicament, if of metal; and, if of glass, will holdit compactly together should it become broken'. This latter function is that of a continuous splint. The piston g is of solid rubber, and may either be made integral with the piston-rod tube or separate. It is formed with a rounded end, the base of whichV constitutes its largest diameter, and from this base h it tapers back, forming a solid-surface y packing at the base h, which, not only lessens the friction, and 'thereby renders its Working more easy, but gives a solid tt-ing and durable surface, and which Ind more effective than a bulbous hollow-sphere rubber piston.

It is non-absorbent, and always ready for use.`

Its rounded end fits the rounded end of the barrel, and thereby prevents the adm ixture of air with. the injected uid. has a neck, @which fits Within the open end ofthe syringe-barrel,and a flange, j, which acts against the end of said barrel and its rubberjacket. The neck has a conical interior, z, so as to form a space round the pistonv rod, and thereby give the cap the capacity to fit different-sized barrels, or open ends, as,-by

.such construction, it is plain that it can be crowded into an opening of a diameter smaller than that of the neck.

The rubber cap forms a packing of itself, and its combination with the rubber covering of. the piston-rod makes a closer andl more durable fit than could be obtained by any other material, for, in crowding the hollow neck of the cap into a small mouth, it contracts to fit both the mouth and the rubber-covered piston-rod.

I claim- The rubber cap 1. The combination, with a glass syringebarrel, of a rubber jacket therefor, having an end conforming to the shape of the barrel end and openings therein coincident with the bari rel-openings, substantially as and for the purpose herein set forth.

2. In combination with the barrel and piston'rod of a syringe, the rubber tube or covering f for said piston-rod, substantially as and for the purpose herein set forth.

3. In combination with the barrel and tou-rod of a syringe, the solid-rubber piston g, having tapering sides and the packing-base line, as and for the purpose specified. p

4. In combination with the piston-rod e, covered with a rubber tube, f,`and the syringebarrel a, the rubber cap, in the manner and for the purpose herein set forth.

5. The rubber cap of a syringe-barrel, hav.-` ing the interior hollow neck t' and the ange` j, whereb.;T it is adapted as a packing-cap for di'erent-sized barrels, as described.

In testimony that I claim the foregoing I have affixed my signature in presence of two witnesses.

- WILLIAM P. CLOTWORTHY."

Witnesses:

Gno. P. JACKSON, Orcro CHRrsrn. 

